Herbicidal composition of thiocarbamate and 3(3,4-dichlorophenyl)-1-methoxy-1-methylurea

ABSTRACT

A herbicidal composition having synergistic properties is prepared by combining a thiocarbamate having the general formula:   WHEREIN R

United States Patent 1191 Kimura et a1.

[451 July 17,1973

both of Shizuoka; IIideo Ito, Shimizu, all of Japan [73] Assignee: Kumiai Chemical Industry (10., Ltd.,

Tokyo, Japan [221 Filed: July 13,1971

[21] Appl. No.: 162,259

[30] Foreign Application Priority Data July 16, 1970 Japan 45/61739 [52] US. Cl. 71/100, 71/120 [51] Int. Cl A0ln 9/02 [58] Field of Search 71/100, 120

[56] References Cited I UNITED STATES PATENTS 3,037,853 6/1962 Luckenbaugh 71/93 3,112,342 11/1963 Luckenbaugh 71/100 3,385,690 5/1968 Luckenbaugh 71/93 3,671,216 6/1972 Kado et a1. 71/100 FOREIGN PATENTS OR APPLICATIONS 634,786 1/1962 Canada 71/100 OTHER PUBLICATIONS Kimura et al., Herbicidal Cymetrin etc, (1970), CA72, no. 120341v. (1970).

Primary ExaminerElbert L. Roberts Assistant ExaminerG. Hollrah Attorney-Norman F. Oblon et a1.

[57] ABSTRACT A herbicidal compositionhaving synergistic properties is prepared by combining a thioc'arbamate having the general formula:

wherein R is a lower alkyl group, and3(3,4-

dichorophenyl)-l-methoxy-l-methylurea, having the A formula:

()1 on, o

10 Claims, No Drawings HERBICIDAL COMPOSITION OF TIIIOCARBAMATE AND 3(3,4-DICIILOROPIIENYL) -l -METIIOXY- l METHYLUREA 3 BACKGROUND OF THE INVENTION 1. Field Of The Invention:

This invention relates to a herbicidal composition comprising a synergistic combination of two types of active ingredients.

2. Description Of Prior Art:

It is known that S-(chlorobcnzyl)-N,N-dialkylthiocarbamate, a non-hormone type herbicide, is useful for inhibiting barnyard grass and slender spikerush during initial growth periods. It is also known that this material can be used instead of PCP (sodium pentachlorophenoxide) which has heretofore been widely recognized for this purpose. However, this compound has the disadvantage. that sufficient herbicidal effects against broad-leaved weeds in up-land fields cannot be obtained using an economically feasible quantity of the compound.

It is also known that 3-(3,4-dichlorophenyl)-lmethoxy-l-methylurea, a non-hormone type urea derivative herbicide, demonstrates good herbicidal effects, when applied in amounts of 100 to 200 g. per Ares, and is particularly effective toward broad-leaved weeds. However, this urea derivative is very slow acting and can cause chemical injury to the desired plants, especially in paddy fields having a high moisture content.

' A wide variety of other carbamate type herbicides have also been used especially for up-land field applications. For example, typical carbamates include Cl-IPC (isopropyl-N-3-chlorophenyl carbamate), IPC (isopropyl N-phenylcarbamate), CBN (4-chloro-2-butynyl N- (3-chlorophenyl) carbamate, etc. Although these herbicides are effective at relatively low temperatures, they have a disadvantageously short effective life, especially at higher summer temperatures, and they tend to lose their activity within 4 to 5 days.

'S-(chlorobenzyl)-N,N-dialkylthiocarbumate differs from these other carbamates in that it is characterized by a relatively longer life without being affected by temperature, and its effective life is from thirty to forty days, even during the summer months. The toxicity of this compound toward such useful plants as soybean, dry land rice, cotton, corn, wheat and barley is quite low, so it can be used safely even when applied in amounts of eight to ten times the quantity normally re-. quired for effective inhibition of gramineous weeds, such as barnyard grass, large crabgrass and water foxtail. However, in order to completely inhibit broadleaved weeds, eight to ten times the quantity needed for gramineous weeds, is required.

SUMMARY OF THE INVENTION which comprises the combination of S-(chlorobenzyl)- N,N-dialkythicarbamate, having the general formula:

wherein R represents a lower alkyl group, and 3(3,4- dichlorophenyl)- l -methoxyl -methylurea, having the formula:

DETAILED DESCRIPTION OF THE EMBODIMENTS mate, S-( 2-chlorobenzyl )-N ,N-diisopropylthiocarbamate, S-( 2-chlorobenzyl )-N ,N-diethylthiocarbamate and S-(4-chlorobenzyl)-N,N-diisopropylthiocarbamate.

These compoundscan be prepared by reacting the corresponding dialkylamine with carbonyl sulfide (COS) and chlorobenzyl halides in the presence of a base. 3 3 ,4-dichlorophenyl l -methoxyl -methylurea has a melting point of 93-94C. and can be prepared as follows:

(H) CH3 OCH;

OCHa

The mixing ratio of S-(chloro-benzyU-N,N-dialkylthiocarbamate to 3-( 3 ,4-dichlorophenyl )-1 -methoxyl methylurea is preferably 25:l 5:1, and especially about l0: l by weight. It is preferable to use 200-500 g of S-(chlorobenzyl)-N,N-dialkylthiocarbamate and 20 -40 g of 3-(3,4-dichlorophenyl)-l-methoxy-lmethylurea per 10 Ares of up-land field, and when applied in these amounts, a large variety of weeds, including large crabgrass, barnyard grass, lady's thumb, goosefoot, horsetail, Asiatic dayflower, etc. ,can be completely inhibited without causing chemical injury to such useful plants a paddy rice, dry-land rice, soybean, cotton, wheat, corn or barley. In particular, it is quite unexpected that the composition of the present invention is effective against Asiatic dayflower, since this weed is not inhibited by either of two ingredients when used individually. Moreover, it has surprisingly been found that if 200 500 g of S(chlorobenzyl)- N,N-di'alkylthiocarbamate or 20 40 g of 3-(3,4- dichlorophenyl)-l-methoxy-l-methylurea per Ares are used individually, they are ineffective toward broad-[caved weeds or gramineous weeds. it is clear, therefore, that the combination of the two active ingredients provides synergistic effects.

The herbicidal composition of this invention can be effectively applied to water logged fields, such as paddy fields, with good results.

The herbicidal composition of this ivnention can be a simple mixture of the two active ingredients or a mixture of the active ingredients with conventional liquid or solid inert carriers. For instance, suitable inert carriers include water or organic solvents, such as xylene, cyclohexanone and dimethylformamide. If necessary, a surfactant can be included in the composition. Suitable solid inert carriers include bentonite, clay, talc, diatomaceous earth, and porcelain clay. v

The herbicidal composition can be applied by dustin'g, spraying or scattering the composition, in the form of granules, powder or liquid with the inert carrier. It is preferable to apply the herbicidal composition just subsequent to sowing seeds of dry-land rice, soybeam, cotton, corn, or wheat. The herbicidal composition can be applied not only to up-land fields, but also to rice paddy fields.

Good results are attained when the ratio of said thiocarbamate to said 3-(3,4-dichlorophenyl)-l-methoxyl-methylurea is 25:1 5:1 by weight.

If necessary, the active ingredients can be admixed with other conventional insecticides, fungicides or herbicides for specialty purposes.

Having generally described the invention, afurther understanding can be obtained by reference to certain 4 (Example 3 Wettable Powder Twenty percent of S-(4-chlorobenzyl)-N,N-diethylthiocarbamate, l percent of 3-(3,4-dichlorophenyl)-lmethoxy-l-methylurea, 3 percent of sodium lauryl sulfate, 2 percent of sodium dinaphthylmethane sulfonate, twenty percent of white carbon (silica powder) and 54 percent of diatomaceous earth were mixed and crushed to yield a wettable powder.

(Example 4) Emulsion Forty percent of S-(4-chlorobenzyl)-N,N-diethylthiocarbamate, 4 percent of 3-(3,4-dichlorophenyl)-lmethoxy-l-methylurea, 15 percent of a mixture of polyoxyethane alkylphenyl ether and calcium-alkylbenzenesulfonate and 41 percent of xylene were mixed to yield an emulsion.

(Example 5) Granules (Example 6) Emulsion Forty percent of S-( 4-chlorobenzyl )-N,N diisopropylthiocarbamate, 4 percent of 3-( 3 ,4- dichlorophenyl)- l -methoxyl -me thylurea, 15 percent of a mixture of polyoxyethane alkylphenyl ether and specific Examples which are provided herein for purpose of illustration only and are not intended to be limiting in any manner. The percentages shown in the Ex- 'amples are percentages-by'weight.

1 (Example 1) Granule Seven percent of S-(4-chlorobenzyl)-N,N-diethylthi5 ocarbamate, 0.7 percent of 3-(3,4-dichlorophenyl)-l- (Example 2) Powder Ten percent of S-(4-chlorobenzyl)-N,N-diethylthiocarbamate, 2 percent of 3-(3,4-Dichlorophenyl)- lmethoxy-l-methylur ea, 88 percent of mixture of diatomaceous earth and clay powder were crushed and mixed to yield a powder composition.

calcium alkylbenzene sulfonate, and 41 percent of xylene were mixed to dissolve them, to yield an emulsion. Certain experimental results by applying theherbicidal composition of this invention are illustrated.

, (EXPERIMENT l per [0 Ares and sprayed onto the field. One month following the application, the growth of weeds and chemical injury of useful plants were, respectively, observed.

Test period: from July l5th to August [5th Sunny days: 25 days Sunlight: I67 hours Rainy days: 5 days Rain fall (prccipitatiim) l5S.6 mm.

Test place Kikukawa-cho Ogasa gun Shizuoka-kcn, Japan The results are shown in Table I, wherein the amount of ingredient is the weight of ingredient per 10 Ares, and the herbicidal effect is shown as the following indications:

dead

severe inhibition fair inhibition moderate inhibition slight inhibition no effect =Very slight; Slight; Fair; Severe.

E Large ombgrass; F" Barnyard grass; Broad-heaved weeds.

- TABLE 1 Herbicidal eiiect Chemical injury Amount of ingredient, Rice, Rice Active ingredient g./ ares E" I U Soybean Cotton Wheat Corn dry paddy Compound A 50 0 0 0 None. None. None. None. None. None. 100 1 1 0 (1 Do. 200 3 3 1 Do.

Compound B l0 0 0 None. None- None. None. None. None l I) 1.... 40 2 l 100 3 3 h Composition of compound: +10 3 2 None. None Nonev I A+B 50+20 4 3 .do.. Do. 100+40 5 .4 do ..do ..do. Do. 200+40 5 5 do ..do .do- Do. (Adi) 2200-1-20 5 5 ..d0 ..do ..d0 .do. Do.

No treatment 0 0 I) None. None. None. None None. None.

NOTES! I I Compound A S-(4-ehlorobenzyD-N ,N-diethylthiocarbamate; Compound B =3-(3,4-dichlorophenyl)-l-methoxy-1-methyluroa.

(Experiment 2) I-lerbicidal Test A pot of 800 cm made of polyethylene was filled with up-land soil and further was covered to a depth of 0.5 cm. with soil containing 50 pieces of various seeds shown in Table I], each of various seeds per pot. The emulsion of herbicidal composition prepared in Example 4 was diluted with water and was applied at the rate of 12 ml. per pot.

Following the application, the pot was kept in a greenhouse at an average temperature of 25C. 40 days after the application of the herbicides, the herbicidal effects were observed in accordance with the measurement of Experiment 1.

The results are shown in Table II.

TABLE II Amount of Active Ingredient Herbicidal Effect Ingredient (g/IO Ares) F E H l J K L Compound A 25 I l 0 0 0 0 0 50 2 2 0 0 0 0 0 I00 3 3 0 l 0 0 .0 (control) 200 4 3 2 2 2 0 0 400 5 4 3 4 4 l 2 Compound B 6.25 0 0 0 0 l 0 0 12.5 0 l 0 2 3 0 0 (control) 25 a I 0 3 f l 4 4 O 0 50 -2 4 3 4-5 5 .0 0 Composi tion of compounds- A+B A+B 45+5 4 4 4 3 4 2 3 90+l0 5 5 4-5 4 5 4 9 l80+20 5 5 5 5 5 5 5 360+40 5 5 5 5 5 5 5 No treatment 0 0 0 0 0 0 O E large crabgrass J lady's-thumb "F barnyard millet K siatic dayflower "H goosefoot L Anelena Keisak HASSK "I barnyard grass (EXPERIMENT 3) Herbicidal test in dry field by sowing seeds The field having weeds seeds of barnyard grass in paddy field, Asiatic dayflower, lady's-thumb was divided into 4m per block (2 X 2 m.) and rice seeds,

(species Kimmaze) were sowed in three lines. Next day, the wettable powder prepared in Example 3 or control diluted with water, was sprayed at the rate of 150 liters per 10 Ares.

Rice was planted by conventional direct seed sowing method onto dry field.

Forty days after the application of the herbicides, the herbicidal effects were observed, in accordance with the measurement of Experiment 1. Then the field was filled with water to a depth of S cm. The results from an average ofthree blocks are shown in Table III. The

herbicidal tests were made in each three blocks TABLE III Amount of 3 Active ingredient Herbicidal Effect Chemical ingredient (g/IO Ares) I Injury M J K Compound A 200 2 0 0 none 400 4 2 0 (control) 600 4-5 4 l v Compound B 25 l 2 0 -H- 50 2 3 0 +H- (control) 100 3-4 4 O H++ 200 4-5 4-5 I +H+ A B Composition of 90 +l0 3 3 2 none Compounds A+B l+20 4 4 3-4 360+40 5 5 5 37 720+80 5 5 5 No treatment 0. 0 0 none M barnyard grass in paddy field .I lady's-thumb K Asiatic dayflower (Experiment 4) l-lerbicidal effect in soybean field A dry field of volcanic soil having good permeability and medium water-retaining property and containing humus soil was cultivated by a tractor on May 18, and was divided into 15 m per block and the herbicidal tests were made in each two blocks.

On May 26, soybean seeds were sowed. Each predetermined amount of herbicide was diluted with water at the rate of I00 liters per I0 Ares and was sprayed to the field by a small size sprayer two days after seeding before germination.

On July 6, after 39 days from the application of herbicide, the herbicidal effects were observed. p

The results at average of two blocks are shown in Table IV.

41. The herbicidal composition according to claim 1, v

which is in granular form in combination with an extender and a binder.

8. The herbicidal composition according to claim 1 which is in the form of a water miscible solution.

9. The herbicidal composition according to claim I which is in the form of an emulsion.

10. The herbicidal composition according to claim 1 which is in the form of a powder. 

2. The herbicidal composition according to claim 1, wherein said thiocarbamate is S-(4-chlorobenzyl)-N,N-diethylthiocarbamate.
 3. The herbicidal composition according to claim 1, wherein said thiocarbamate is S-(4-chlorobenzyl)-N,N-dimethylthiocarbamatE.
 4. The herbicidal composition according to claim 1, wherein said thiocarbamate is S-(4-chlorobenzyl)-N,N-diisopropylthiocarbamate.
 5. The herbicidal composition according to claim 1, wherein said thiocarbamate is S-(2-chlorobenzyl)-N,N-diethylthiocarbamate.
 6. The herbicidal composition according to claim 1, wherein said thiocarbamate is S-(2-chlorobenzyl)-N,N-diisopropylthiocarbamate.
 7. The herbicidal composition according to claim 1 which is in granular form in combination with an extender and a binder.
 8. The herbicidal composition according to claim 1 which is in the form of a water miscible solution.
 9. The herbicidal composition according to claim 1 which is in the form of an emulsion.
 10. The herbicidal composition according to claim 1 which is in the form of a powder. 